District Information

The principal objective of the West Umatilla Mosquito Control District and the basic reason for its formation is to provide a comprehensive mosquito control program as the means for preventing the transmission of Western Equine Encephalitis through the reduction of its primary vector, the mosquito Culex tarsalis. Secondary objective which is also accomplished by the district’s comprehensive program includes, freedom from mosquito annoyance increasing yields in livestock, enjoyment of our yards, patios, parks, golf courses and other outdoor recreational areas. The West Umatilla Mosquito Control District (WUMCD) was one of the first vector control program in Oregon, voter created as an independent taxing district in 1971. WUMCD has 5 appointed trustees, 3 full-time and several part-time employees. The average length of employment is approximately 10 years. The professional staff includes the District Manager, a Field Supervisor, and an Office Administrator. WUMCD’s budget is approximately $800,000 with most of that generated by ad valorem property taxes. WUMCD is a sustaining member of the Northwest Mosquito and Vector Control Association (NWMVCA), the American Mosquito Control Association (AMCA), the Oregon Mosquito and Vector Control Association (OMVCA), and the Special Districts Association of Oregon (SDAO). WUMCD participates in the Environmental Protection Agency’s Pesticide Environmental Stewardship Program (PESP) by being a “PESP partner under the NWMVCA and AMCA’s auspices”.

West Umatilla Vector Control Districts Mosquito Control Policy:
The West Umatilla Vector Control District supports management of vector populations when and where necessary by means of an integrated program designed to benefit or to have minimal adverse effects on people, domestic animals, wildlife and the environment. This integrated pest management policy recognizes that vector populations cannot always be eliminated, but often must be suppressed to tolerable levels for the well being of humans, domestic animals and wildlife. Selection of scientifically sound suppression methods must be based upon consideration of what is ecologically and economically in the long-term interest of humankind.
The following principles are to be followed:
  • Vector control measures should only be undertaken when there is adequate justification based upon surveillance data.
  • The combination of methods for vector control should be chosen after careful consideration of the efficacy, health effects, ecological effects and cost versus benefits of the various options; including public education, legal action, natural and biological control, elimination of the breeding sources, and pesticide applications.
  • Vector breeding sources, whether natural or created by human activity, should be altered in such a manner as to cause the least undesirable impact on the environment.
  • Pesticides and application methods should be used in the most efficient and least hazardous manner in accordance with all-applicable laws, regulations and available scientific data. The registered label requirements for pesticide use should be followed. When choices are available among effective pesticides, those offering the least hazard to non-target organisms should be used. Pesticides should be chosen and used in a manner that will minimize the development of resistance in vector populations.
  • Personnel involved in the Vector Control program should be properly trained and supervised, certified in accordance with relevant laws and regulations, and should keep current with improvements in management techniques through continuing education and/or training programs.
All methods and materials used by the District are based on these principals.

West Umatilla Vector Control District was created in 1972 under provisions of Chapter 452, Oregon Revised Statutes to provide a program for relief from mosquitoes in a 515 square mile area of Western Umatilla County. Changes in the Statutes have substantially altered the definition of "public health vectors" to include additional arthropods and rodents since the formation of the district. As the district was originally formed and funded for mosquito control, the boards of trustees have designated that mosquito control shall be the principal program of the district. However the board has established the policy that the district will provide to residents of the district technical information regarding other vector pest and their control so far as personnel, time, and monies permit. The district board of trustee's have established policy and guidelines and employed personnel to implement a comprehensive control program. The program is reviewed annually for revisions to adjust to regulatory and ecological requirements or changing conditions. The district program is financed by a property tax levy. A tax base for the district was established in the fall of 1972 and increased in May of 1996. Mosquito control today is an integrated management program that recognizes that mosquito populations cannot always be eliminated, but can be suppressed to tolerable levels for the well being of humans, domestic animals or wildlife. Selection of scientifically sound methods must be based on consideration of what is ecologically and economically in the best interest of mankind over the long term. Much of the progress in the district program is due to the support, cooperation and assistance received from numerous individuals, firms and agencies and is greatly appreciated by the board of trustees and district employees. PROFESSIONAL AFFILIATIONS American Mosquito Control Association Northwest Mosquito and Vector Control Association Oregon Vector Control Association Utah Mosquito Abatement Association Mosquito and Vector Control Association of California Special Districts Association of Oregon Hermiston Chamber of Commerce


Randy A. Gerard
Randy A. Gerard

District Manager

Creative, detail-oriented, always focused.

Janie Cuellar
Janie Cuellar

Office Manager

Curious, tech-geeck and gets serious when it comes to work.

Andrew Ross
Andrew Ross

Field Supervision

Enthusiastic, passionate with great sense of humor.

    Contact us

    West Umatilla Mosquito Control District 3005 South First Street Hermiston, Oregon 97838
    Phone: 541-567-5201 - voice
    866-564-8254 - fax